The races are seated by a press fit. Tap them out with a long straight punch and 2lb hammer fro the other side. I use a aluminum bearing race driver set to reinstall them. These are available from snap on or Mac tools or others. To pack the new bearings, I like the plastic cone packer sold at auto parts stores that hooks to your grease gun. Pack until grease spews out of the bearing. NLGI 2 wheel bearing grease is used. The seal is pried out with a prybar and reinstalled with the race driver.